(Swift 3,4,5...) PKCS11 Find Specific Certificate on Smart Card or USB Token

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This example code shows how to find a particular certificate on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.88 or later.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    let pkcs11 = CkoPkcs11()!

    // Set your shared lib path -- either a full path to the DLL, .so, or .dylib,
    // or just the filename if the driver is in a location that can be automatically found. (Such as in C:\Windows\System32)
    pkcs11.sharedLibPath = "C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll"

    var success: Bool = pkcs11.initialize()
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        return
    }

    // Pass -1 for the slotID to open a session on the first non-empty slot.
    var slotID: Int = -1

    // Open a session.
    var readWrite: Bool = true
    success = pkcs11.openSession(slotID, readWrite: readWrite)
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        return
    }

    // Make it an authenticated session by calling Login.
    // 
    // If we don't authenticate, then we won't be able to see the private keys, and thus
    // we won't know which certificates have an associated private key stored on the smart card.

    // The smart card PIN is passed to the Login method.
    // userType 1 indicates a "Normal User".
    var userType: Int = 1
    var pin: String? = "0000"
    success = pkcs11.login(userType, pin: pin)
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        success = pkcs11.closeSession()
        return
    }

    // --------------------------------------------------------------------------
    // The FindCert method can find a particular certificate in a number of different ways.
    // I'll demonstrate some common ways..

    // 1) In many cases you'll be working with a smart card that contains one certificate that is to be used for 
    // signing, and it is the certificate that is associated with the private key also stored on the smart card (or USB token).
    // There may be other certificates on the card, but these are the issuer certificates in the chain of authentication.
    // You're just interested in getting the certificate with the private key.
    // You can do it like this:
    let cert = CkoCert()!
    // Pass the keyword "privateKey" in the 1st argument, and an empty string in the 2nd arg.
    // This returns the 1st certificate that has a private key.
    success = pkcs11.findCert("privateKey", partValue: "", cert: cert)
    if success == true {
        print("Cert with private key: \(cert.subjectCN!)")
    }
    else {
        print("No certificates having a private key were found.")
    }

    // 2) Find a certificate by the Subject Common Name
    success = pkcs11.findCert("subjectCN", partValue: "Chil application account (8c9be8e0-5544-4cd0-9062-290fbff353a7)", cert: cert)
    if success == true {
        print("Found: \(cert.subjectCN!)")
    }
    else {
        print("Not found: \(cert.subjectCN!)")
    }

    // 3) Find a certificate by hex serial number
    success = pkcs11.findCert("serial", partValue: "5087bf1feda006af54a02f23a851104948acc26f", cert: cert)
    if success == true {
        print("Found: \(cert.serialNumber!)")
    }
    else {
        print("Not found: \(cert.serialNumber!)")
    }

    // 4) Find a certificate by hex serial number and Issuer Common Name
    success = pkcs11.findCert("serial:issuerCN", partValue: "5087bf1feda006af54a02f23a851104948acc26f:Ibanity Production Third Party Application CA", cert: cert)
    if success == true {
        print("Found: \(cert.subjectCN!)")
    }
    else {
        print("Not found: \(cert.subjectCN!)")
    }

    // --------------------------------------------------------------------------

    // Revert to an unauthenticated session by calling Logout.
    success = pkcs11.logout()
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        success = pkcs11.closeSession()
        return
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = pkcs11.closeSession()
    if success == false {
        print("\(pkcs11.lastErrorText!)")
        return
    }

    print("Success.")

}